The skimmers take credit card information and send it remotely to someone sitting within Bluetooth range at a computer.

And unlike other skimmers, the equipment can't be seen from the outside of the pump, according to a press release from the Fairfax County Police Department Wednesday.

Over the last year, police have removed 21 individual skimmers from 15 different locations in Fairfax County.

Fairfax County Police maintains a Financial Crimes unit to confront scams like this. But there are still steps a consumer can take to prevent becoming a victim.

For one, use a credit card when possible and not a debit or ATM card. Scammers are able to decipher a PIN and clone cards quickly. It also may be more difficult to have a personal bank reimburse funds.

Additionally, avoid older gas pumps which are easier to infiltrate and alter, check bank statements regularly and if you notice anything fraudulent or questionable, contact your credit card company immediately.